Hello Pablo,
Thanks for clearing things up
Got to head off to work now so need to brief
- I mean I opened up the desktop case, unplugged the CPU power cord, did the same to the HD and took the RAM memory card out of the slot.
Not sure who advised you to disconnect the CPU power cord but that is totally wrong and initially there is no need to disconnect the HDD.
On a MB that has an onboard speaker when you are not getting any display at all, the idea is to remove just the RAM and then power up the computer, if you then get error beeps it suggests that the problem is after the RAM has been tested as part of the POST with the graphics being tested next, error beeps and no display commonly means a problem with the graphics solution and that the RAM is ok.
If you get no error beeps on a MB with an onboard speaker when the RAM is removed it means that the problem is before the RAM is tested as part of the post with the PSU and MB being bad the two most common causes, fwiw, MBs are more prone to failure than CPUs.
The following checks require the computer case to be opened so take the following safety precautions 1st, disconnect any attached hardware such as the keyboard and printer etc, disconnect the power cord from the wall socket, press the case power button for 10 seconds or so to get rid of any residual charge in the system, remove the side of the case, be sure to take anti static precautions before touching anything inside, you can do this by touching a bare metal part of the case or the PSU.
I suggest that you reconnect the CPU ATX power supply and the HDD, leave out the RAM, power up the computer and see if you get any error beeps.
Edited by PhillPower2, 13 May 2017 - 03:06 AM.